<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <style>
         .top {
            color:black;
            font-size: 30px;
            text-align: center;
            background-color: red;
            height: 400px;    
            width: 400px;
            position: relative;
            top: 200px;
            left: 600px;    
        }
        </style>
</head>
<body>
        <div class="top">
    <p>欢迎回来</p>
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        </ul>
    </div>
</body>